Legacy ImageMagick Discussions Archive

It works for me too, thank you so much! .pgm binary and .tif export work well with QGIS. I must say, this is hugely quicker than looping the execution of GDAL raster calc scripts that only allow 26 images at a time. Fantastic

Thank you for the speedy response! Q level is Q16. When I use -depth 16, I get an image only made up of values of 0 and 65535. I'm determining the output values using the GIS program, or by using -compress none to get an ASCII .pgm instead of binary and viewing the output in a text editor. Here is a ...

I am adding pixel values together from multiple images, for GIS analysis, using ImageMagick 7.0.7-11. My source images are 8-bit, greyscale pngs, with black and white pixels only to be treated as 0s and 1s. I am using .pgm output. The following code which works perfectly on 255 images or less ...